June 1992 Constitutional Proclamations about language: http://www.unesco.org/most/lnparagu.htm

See an example of Guarani text alongside its English equivalent: http://www.geocities.com/Athens/9479/guarani.html

"Paraguayan language policy: a sociolinguistic and post-colonial perspective" http://www.ac.wwu.edu/~sngynan/f99paper.html
Interesting abstract by Shaw Gynan: http://www7.tamu-commerce.edu/swjl/public_html/swjl/01_1abstracts.html